SN74HCS166QPWRQ1

Shift Registers Overview

The SN74HCS166QPWRQ1 is an automotive-grade, 8-bit parallel-load shift register with Schmitt-trigger inputs. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range from -40°C to +125°C. The device features balanced CMOS push-pull outputs capable of ±7.8-mA drive current at 6 V. It includes a serial input (SER), eight parallel data inputs (A through H), clock (CLK) and clock inhibit (CLK INH) inputs, an active-low asynchronous clear (CLR), and a shift/load control (SH/LD). The component is housed in a 16-pin TSSOP package.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide high noise immunity and tolerance for slow signal transitions.
• Balanced CMOS push-pull outputs deliver strong source and sink drive capabilities.
• Asynchronous clear function overrides all other inputs to reset the register state immediately.

Shift Registers Applications

• Microcontroller input expansion
• 8-bit data storage

Shift Registers Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the SN74HCS166-Q1 family includes both SOIC and TSSOP variants. Confirm AEC-Q100 qualification status and ensure the selected part number aligns with the intended operating voltage and temperature requirements for the target automotive application.

Shift Registers Selection Notes

Select this component when interface expansion without complex communication protocols is required. The Schmitt-trigger architecture makes it suitable for noisy environments or applications involving slow-rising signals. Ensure the design accommodates the specified power supply range and thermal characteristics for reliable operation across the full automotive temperature spectrum.

Shift Registers Part Context

This device belongs to the SN74HCS-Q1 series of automotive logic components manufactured by Texas Instruments. The 'HCS' designation indicates High-Speed CMOS technology with Schmitt-trigger inputs, designed to offer improved performance over standard HC logic while maintaining low power consumption and robust noise rejection capabilities for demanding vehicle electronics.

Shift Registers Replacement Considerations

SN74HCS166PW-Q1

Shift Registers FAQ

How does the SH/LD pin control the device operation?

When the SH/LD input is high, the device enables serial shifting on clock pulses. When the SH/LD input is low, parallel data inputs are enabled, and synchronous loading occurs on the next clock pulse.

What is the function of the CLK INH input?

The CLK INH input acts as a clock inhibit. Holding either the CLK or CLK INH input high inhibits clocking, allowing the system clock to be free-running while the register can be stopped on command via the other input.